radio frequency

frequency

[fre´kwen-se]

1. the number of occurrences of a periodic or recurrent process in a unit of time, such as the number of electrical cycles per second measured in hertz. In cardiac pacing terminology, frequency is expressed by the formula: frequency = ½ × pulse width.

2. the number of occurrences of a particular event or the number of members of a population or statistical sample falling in a particular class.

radio frequency the range of frequencies of electromagnetic radiation between 10 kilohertz and 100 gigahertz, used for radio communication.

relative frequency the ratio of the number of occurrences of a specified phenomenon in a population to the total size of the population.

urinary frequencyurination at short intervals without increase in daily volume of urinary output, due to reduced bladder capacity or cystitis.

radio frequency

An MRI term for an electromagnetic wave with a frequency in the same range as that used for transmitting radio and television signals. The RF pulses used in MRI are usually in the 1–100 megahertz range, which cause heating of a structure or tissue due to RF pulse absorption.

"The support of the Worldwide Port System program management folks allowed us to gain proof of concept to use Radio Frequency Identification tag data as the source for Worldwide Port System in-transit visibility updates in lieu of printing and scanning military shipping labels," said Harvey.

"The literature raises serious concerns regarding the levels of radio frequency (3 kilohertz to 300 gigaherts) or extremely low frequency (300 hertz) exposures produced by 'smart meters' to warrant an immediate and complete moratorium on their use and deployment until further study can be performed," the academy asserts.

The high transmission powers of radar are prone to affect spectrum use that is within the transmission areas of radar, and radar is very susceptible to radio frequency interference when it is receiving its very weak returned signal.

In response to this global marketplace interest, in January, 2005 EPCglobal submitted C1G2 specifications to international standards organizations ISO/IEC to be included in ISO/IEC 18000 Part 6 Type C - Radio Frequency Identification (RFID) for Item Management.

While e-commerce and the Internet enable everyone to be interconnected, emerging technologies such as radio frequency identification, sensors and wireless networks will combine to give the Internet eyes and ears--eventually bringing everything online.

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